Chevrolet P0422
The technician should follow SI diagnostics. If no cause for the concern is found or during diagnosis a leak ch
Quick answer
For Chevrolet vehicles listed below, P0422 appears in an official GM/NHTSA service communication as one of many possible codes that may occur with a charge-air-cooler/induction-system leak concern. Follow GM Service Information (SI) diagnostics. The supplied evidence does not establish the complete code definition or a vehicle-specific repair.
This page separates verified manufacturer/regulator evidence from supporting material. Unsupported causes, repairs or safety conclusions are not guessed.
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1. What does P0422 mean?
For Chevrolet vehicles listed below, P0422 appears in an official GM/NHTSA service communication as one of many possible codes that may occur with a charge-air-cooler/induction-system leak concern. Follow GM Service Information (SI) diagnostics. The supplied evidence does not establish the complete code definition or a vehicle-specific repair.
2. Technical explanation
NHTSA manufacturer communication PIP5684C states that a charge air cooler/induction-system leak may cause the concern and lists P0422 among numerous possible current or history DTCs. The communication directs technicians to follow SI diagnostics and indicates additional diagnostic action if no cause is found or if a leak is checked during diagnosis; however, the supplied excerpt ends before that instruction is complete. Therefore, no further diagnostic or repair conclusion is established here.
3. What system is affected?
Not yet established by verified evidence. The cited communication associates the concern with the charge air cooler/induction system.
4. How serious is this code?
Not yet established by verified evidence.
5. Symptoms you may notice
- The source excerpt indicates that a malfunction indicator lamp may be illuminated.
- The source excerpt indicates the customer may intermittently report reduced engine power.
6. Possible causes
- A leak in the charge air cooler/induction systems may be a cause of the concern described in the cited manufacturer communication.
7. Can I still drive the vehicle?
Not yet established by verified evidence.
8. Can I charge the vehicle?
Not yet established by verified evidence.
9. What you can safely do
- Arrange diagnosis using Chevrolet/GM Service Information (SI) procedures.
- Do not attempt high-voltage-system repair based on this DTC information.
10. Step-by-step troubleshooting
- A qualified technician should follow SI diagnostics, as directed by NHTSA manufacturer communication PIP5684C.
- The supplied evidence does not provide a complete step-by-step diagnostic procedure.
11. When to contact service
Contact a Chevrolet dealer or qualified service provider for diagnosis using GM SI procedures, particularly if a warning lamp is illuminated or reduced power is present.
12. What the service center may check
- Follow applicable GM SI diagnostics.
- Evaluate the charge air cooler/induction system for a leak as applicable to the concern described in PIP5684C.
13. Possible repair or resolution
- Not yet established by verified evidence. The cited communication does not provide a complete repair outcome in the supplied excerpt.
14. Affected vehicles
- Chevrolet Bolt EV · 2011–2018 · US
- Chevrolet Spark · 2011–2018 · US
- Chevrolet Volt · 2011–2018 · US
15. Related TSBs / service bulletins
- PIP5684C, published October 22, 2020, is an NHTSA-posted manufacturer communication. It lists P0422 among many DTCs associated with a possible charge air cooler/induction-system leak concern and directs technicians to follow SI diagnostics.
16. Recall information
- Not yet established by verified evidence.
17. Official manufacturer information
Official source: NHTSA Manufacturer Communication PDF 10182564, PIP5684C: https://static.nhtsa.gov/odi/tsbs/2020/MC-10182564-9999.pdf
19. Frequently asked questions
What does the supplied official communication say about P0422?
It lists P0422 among many possible history or current DTCs in a concern that may be caused by a charge air cooler/induction-system leak.
Does the evidence confirm that P0422 alone proves an induction-system leak?
No. The communication says such a leak may be the cause of the described concern; it does not establish that P0422 alone confirms a leak.
What should a technician do?
Follow GM Service Information diagnostics, according to PIP5684C.